The first editor, Gabriel Ciobanu, has considerable experience in natural computing and theoretical computer science, and coedited the Natural Computing series book «Modelling in Molecular Biology» (2004). The second editor initiated the field of membrane computing in 1998; authored in 2002 the Natural Computing series book «Membrane Computing — An Introduction», the only dedicated book on this topic; and has co-organized and co-edited relevant workshops (e.g., the International Workshop on Membrane Computing 2002) and proceedings. The third editor, Mario J. Perez-Jimenez, has considerable experience in the fields of natural computing, molecular computing, DNA computing, unconventional computing, etc., and recently coorganized the Int. Workshop on Membrane Computing 2004.